# Spot a COA lot mismatch

Recorded September 19, 2026. Silent continuous local browser walkthrough with visible captions; only idle ending time removed. Fictional records, not a laboratory test, supplier audit, or product safety certification.

[Watch the MP4](https://peptides.editorialdeskmedia.com/downloads/peptide-coa-walkthrough-2026-09-19.mp4)

1. Start with the lot. The fictional quote names EXAMPLE-B; its attached report names EXAMPLE-A.
2. A date and purity result do not resolve a different lot identifier. Record the report as present, but its applicability to the offered lot as unverified.
3. Ask about the exact report, revision, date and lot. Find the issuer's contact independently through its official website and follow your institution's process.
4. Download the worked-example CSV. Keep observations, unresolved questions and next actions separate.
5. This exercise does not establish what is in a material, whether it is suitable for any use, or whether any supplier should be chosen.

[Read the complete guide](https://peptides.editorialdeskmedia.com/guides/read-a-peptide-coa)

[Download the fictional worksheet](https://peptides.editorialdeskmedia.com/downloads/peptide-coa-worked-example.csv)

Publication: Peptide Suppliers Compared, Editorial Desk Media. This educational demonstration contains no vendor endorsement. Its captions and practice records were prepared with AI assistance and checked against the recorded browser actions.